This sounds crazy, a tad bit stupid and most likely OP so sorry for asking, but what about a block that recharges a battery using Forge Energy?
Maybe it could use a ton of power in order to charge the battery, or make it one-time use like the jumper cables?

Given the lack of electric vehicles, and the fact mods allow for liquification of redstone, I'm going to pass on this. Would be a dependency and extra complexity should MTS ever update to 1.14.4 where RF doesn't exist.

It was something that we thought of doing, but it's rather hard to get such blocks into the game. However, as I'm planning to move the code to 1.12.2 only, this may be something I can re-visit.

This could probably also open the doors to electric engines